<br> var spector;<br> var captureOnLoad = false;<br> var captureOffScreen = false;<br> window.__SPECTOR_Canvases = [];<br><br> (function() {<br> var __SPECTOR_Origin_EXTENSION_GetContext = HTMLCanvasElement.prototype.getContext;<br> HTMLCanvasElement.prototype.__SPECTOR_Origin_EXTENSION_GetContext = __SPECTOR_Origin_EXTENSION_GetContext;<br><br> if (typeof OffscreenCanvas !== 'undefined') {<br> var __SPECTOR_Origin_EXTENSION_OffscreenGetContext = OffscreenCanvas.prototype.getContext;<br> OffscreenCanvas.prototype.__SPECTOR_Origin_EXTENSION_OffscreenGetContext = __SPECTOR_Origin_EXTENSION_OffscreenGetContext;<br><br> OffscreenCanvas.prototype.getContext = function () {<br> var context = null;<br> if (!arguments.length) {<br> return context;<br> }<br> <br> if (arguments.length === 1) {<br> context = this.__SPECTOR_Origin_EXTENSION_OffscreenGetContext(arguments[0]);<br> if (context === null) {<br> return context;<br> }<br> }<br> else if (arguments.length === 2) {<br> context = this.__SPECTOR_Origin_EXTENSION_OffscreenGetContext(arguments[0], arguments[1]);<br> if (context === null) {<br> return context;<br> }<br> }<br> <br> var contextNames = ["webgl", "experimental-webgl", "webgl2", "experimental-webgl2"];<br> if (contextNames.indexOf(arguments[0]) !== -1) {<br> // context.canvas.setAttribute("__spector_context_type", arguments[0]);<br> // Notify the page a canvas is available.<br> var myEvent = new CustomEvent("SpectorWebGLCanvasAvailableEvent");<br> document.dispatchEvent(myEvent);<br> this.id = "Offscreen";<br> window.__SPECTOR_Canvases.push(this);<br> <br> if (captureOnLoad) {<br> // Ensures canvas is in the dom to capture the one we are currently tracking.<br> if (false) {<br> spector.captureContext(context, 500, false, false);<br> captureOnLoad = false;<br> }<br> }<br> }<br> <br> return context;<br> }<br> }<br><br> HTMLCanvasElement.prototype.getContext = function () {<br> var context = null;<br> if (!arguments.length) {<br> return context;<br> }<br><br> if (arguments.length === 1) {<br> context = this.__SPECTOR_Origin_EXTENSION_GetContext(arguments[0]);<br> if (context === null) {<br> return context;<br> }<br> }<br> else if (arguments.length === 2) {<br> context = this.__SPECTOR_Origin_EXTENSION_GetContext(arguments[0], arguments[1]);<br> if (context === null) {<br> return context;<br> }<br> }<br><br> var contextNames = ["webgl", "experimental-webgl", "webgl2", "experimental-webgl2"];<br> if (contextNames.indexOf(arguments[0]) !== -1) {<br> context.canvas.setAttribute("__spector_context_type", arguments[0]);<br> // Notify the page a canvas is available.<br> var myEvent = new CustomEvent("SpectorWebGLCanvasAvailableEvent");<br> document.dispatchEvent(myEvent);<br><br> if (captureOffScreen) {<br> var found = false;<br> for (var i = 0; i < window.__SPECTOR_Canvases.length; i++) {<br> if (window.__SPECTOR_Canvases[i] === this) {<br> found = true;<br> break;<br> }<br> }<br> if (!found) {<br> window.__SPECTOR_Canvases.push(this);<br> }<br> }<br><br> if (captureOnLoad) {<br> // Ensures canvas is in the dom to capture the one we are currently tracking.<br> if (this.parentElement || false) {<br> spector.captureContext(context, 500, false, false);<br> captureOnLoad = false;<br> }<br> }<br> }<br><br> return context;<br> }<br> })()
You can do it yourself with this tutorial! www.youtube.com/watch?v=XfZ3qG7fIXc